The events of this incursion constituted a Pogo paradox, in which interference to prevent an event actually triggers the same event. It also set into motion a chain of events in which a group of surviving drones were revived in 2153, and subsequently sent a message to the Delta Quadrant, where it was received by the Collective in the 24th century, alerting the Borg as to the location of Earth. (ENT: "Regeneration"; VOY: "Relativity")

Annorax

The Krenim weapon ship initiates a temporal incursion against the Ram Izad homeworld.

Annorax, a Krenim scientist, initiated a multitude of temporal incursions during his quest to restore the Krenim Imperium to power. Using a massive weapon ship to literally erase objects from history, he attempted to manipulate the timeline in order to ensure Krenim superiority. His efforts met with failure, however, when erasing the Rilnar civilization from the timeline had disastrous effects for the Imperium. For over a century, Annorax and his crew attempted to restore the Imperium by erasing ships, colonies, and even entire civilizations from history. In 2374, Annorax was opposed by the crew of the USS Voyager, who were attempting to cross through Krenim space on their journey back to the Alpha Quadrant. Eventually, as a result of massive battle damage, a temporal incursion was initiated within the weapon ship itself, erasing it, and all of the damage it had caused to history, from the timeline. (VOY: "Year of Hell", "Year of Hell, Part II")

Voyager

During its seven-year voyage through the Delta Quadrant, the starshipVoyager was involved in numerous temporal incursions, including those involving the Krenim. Some notable examples include:

Traveling back in time to Earth, 1996, after a confrontation with 29th centuryStarfleet officer CaptainBraxton, in which Braxton described Voyager's involvement with a devastating temporal explosion in the future. Ironicaly caused by Braxton's efforts to prevent it. Future saved when Voyager destroys Braxton's temporal ship then is returned to its correct time by Braxton from the corrected future. (VOY: "Future's End")

Nero

The Narada emerges from the black hole in the year 2233

In the year 2387, when a supernova threatened to destroy the entire galaxy, AmbassadorSpock utilized red matter to create a black hole with which to absorb the exploding star. Although Spock's efforts were successful, he was too late to save Romulus, which was destroyed. Nero, captain of the Romulanmining vesselNarada, confronted Spock, holding him responsible for the destruction of his homeworld. During the confrontation, both vessels were pulled into the black hole and transported back through time, the Narada arriving in the year 2233, resulting in the creation of an alternate reality. Upon emerging from the black hole, Nero immediately attacked the USS Kelvin, setting into motion a chain of events causing a drastic difference in the histories of the two timelines. Spock, having entered the black hole only moments after the Narada, emerged in the year 2258, and was immediately captured by Nero, who forced Spock to witness the destruction of Vulcan at Nero's hands. Eventually, with assistance from Spock, James Kirk and Spock's alternate reality-counterpart were able to put a stop to Nero's efforts to perform the same action on every Federation world, destroying the Narada with another artifically-created black hole. (Star Trek)

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